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Synergistic tumour suppressor activity of E-cadherin and p53 in a conditional mouse model for metastatic diffuse-type
Shu Shimada1, Ayako Mimata, Masaki Sekine
1Department of Molecular Oncology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan.
Gut
|August 26, 2011
Summary
A new mouse model lacking E-cadherin and p53 specifically in stomach cells develops diffuse-type gastric cancer (DGC). This model mimics human DGC, offering insights into gastric carcinogenesis and potential new treatments.
Area of Science:
- Gastroenterology
- Oncology
- Genetics
Background:
- Gastric cancer is a leading cause of cancer death globally, with diffuse-type gastric cancer (DGC) having a poor prognosis.
- Alterations in CDH1 (E-cadherin) and TP53 (p53) are common in DGC.
- Understanding the combined effect of E-cadherin and p53 loss is crucial for gastric carcinogenesis research.
Purpose of the Study:
- To establish and characterize a novel genetically engineered mouse model for studying diffuse-type gastric cancer (DGC).
- To investigate the synergistic effects of E-cadherin and p53 inactivation on gastric carcinogenesis.
Main Methods:
- Generation of a double conditional knockout (DCKO) mouse line by crossing Atp4b-Cre with Cdh1(loxP/loxP) and Trp53(loxP/loxP) mice.
- Detailed examination of the gastric phenotype, including histological analysis and gene expression profiling.
Main Results:
- DCKO mice developed fatal DGC with 100% penetrance within a year, exhibiting histological features similar to human DGC, including signet ring cells.
- The mouse DGC model showed frequent lymph node metastasis and high expression of mesenchymal and epithelial-mesenchymal transition-related genes.
- Gene expression profiles in mouse DGC closely resembled those of human DGC.
Conclusions:
- The established mouse line represents the first genetically engineered model for DGC.
- This model is invaluable for elucidating the mechanisms of gastric carcinogenesis.
- It offers a promising new avenue for developing treatments and preventive strategies for DGC.
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